One hundred seventeen viscose rayon workers exposed to carbon disulfide, and 66 workers who were not exposed to any toxic agent in the working environment, underwent an endocrinological examination that included determination of thyroxine, luteinizing hormone, follicle-stimulating hormone, prolactin, and testosterone in serum by radioimmunoassay methods.

In the viscose rayon factory, the working conditions had not changed subsequent to 1932.